Steel A7-ANN vs A7 HT57-60
Steel · A7 temper comparison
A7-ANN and A7 HT57-60 are two conditions of the same steel grade, A7: ANN (annealed) versus HT57-60 (hardened & tempered 57–60 HRC). The chemistry is identical, so every difference below comes from the condition. A7 HT57-60 is the stronger of the two: yield strength 1,750 MPa (254 ksi) against 500 MPa (72.5 ksi) for A7-ANN, about 3.5 times as much; tensile strength follows at 2,000 MPa (290 ksi) vs 830 MPa (120 ksi). In exchange, A7-ANN is the more ductile: elongation 10% versus 1% for A7 HT57-60, and A7 HT57-60 is harder (58 HRC vs 22 HRC). On the shop floor, A7-ANN machines more easily (poor vs not recommended).
A7-ANNChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
A7 HT57-60Choose it when strength drives the design.
A7-ANN vs A7 HT57-60: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Shear Modulus 79 GPa11.5 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Reduction in Area 15% · Hardness, Brinell 241 HB · Hardness, Rockwell B 99 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.62 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,250°C2,282 °F · Liquidus Temperature 1,400°C2,552 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 20 W/m·K11.6 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11 µm/m·K6.1 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.7 % IACS · Electrical Resistivity 6.4×10⁻⁷ Ω·m25.2 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.55 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 25 / 100 · Brazeability / Solderability 30 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 36 MJ/kg15,477 BTU/lb · Embodied Carbon (primary production) 2.8 kg CO₂/kg · Embodied Water 70 L/kg8.4 gal/lb · Typical Recycled Content 35%
Strength versus weight
Yield strength against density for every steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
A7-ANN vs A7 HT57-60 — frequently asked
Is A7 HT57-60 stronger than A7-ANN?
Yes. A7 HT57-60 has a typical yield strength of 1,750 MPa (254 ksi) against 500 MPa (72.5 ksi) for A7-ANN — about 3.5 times as much. Tensile strength is 2,000 MPa (290 ksi) vs 830 MPa (120 ksi).
Which condition does FabDigit quote by default, ANN or HT57-60?
ANN is the default A7 condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, A7-ANN or A7 HT57-60?
A7-ANN. Its machinability rates poor (18/100) against not recommended (5/100) for A7 HT57-60; for welding the order is A7-ANN first (not recommended, 12/100) then A7 HT57-60 (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in A7-ANN and A7 HT57-60 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.